That is pretty much the Norm for that set-up. If you are using say 150' or more of blast hose then you might would want to bump the air line to 2" just for volume purposes is all. I have my contractors to run 1 1/4" blast hose all the way to the nozzle. The last 50' of hose is the Clemco Supa-Flex hose. It is the same outside diameter as a 1" blast hose, but the ID is of a 1 1/4" blast hose. You loose less pressure this way. All hoses should be sized correctly to reduce pressure loss as much as possible. I hate seeing people using a 185 compressor and running a 3/4" airline to their blast pot and then running 1 1/4" Blast hose to the nozzle and then having to run a #4 or #5 nozzle to keep the pressure up.
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